This 2" focuser adapter will allow you to use our FTF2008BCR on any telescope that accepts 2" accessories. Adapter 2.0" - 2.0" Outer Dia No Thread. This handy adapter will allow you to attach your 2.0" Feather Touch® telescope focuser to any standard 2.0" compression ring holder. This adapter should be used with caution when draw tubes longer than 0.8" are used on the telescope focuser because the draw tube may bottom out 'in to' the adapter. Thank you Roy, from Sundance Observatory, who let us know that "the A20-221 should work for a Celestron C11, C14 and Meade 10", 12", and 14" SCTs using the AP ADASCTLC for Celestron or ADASCTLM for Meade SCTs." Thread: None 2.0" OD Focuser Housing / Base intended for use with 0.8" draw tube